Level Shifter

1. An active matrix type display device comprising: a plurality of pixel thin film transistors over a substrate; and a driver circuit over said substrate for driving said pixel thin film transistors, said driver circuit comprising at least a level shifter, said level shifter comprising: a first thin film transistor of a first conductive type having a source connected to a first power source, and a gate to which a first input signal is inputted; a second thin film transistor of a same conductive type as said first conductive type, having a source connected to said first power source, and a gate to which a second input signal is inputted, wherein said second input signal is an inverted signal of said first input signal; a third thin film transistor of a second conductive type different from said first conductive type, having a drain connected to a drain of said first thin film transistor, and a gate to which said first input signal is inputted; a fourth thin film transistor of a same conductive type as said second conductive type, having a drain connected to a drain of said second thin film transistor, and a gate to which said second input signal is inputted; a fifth thin film transistor of a same conductive type as said second conductive type, having a drain connected to a source of said third thin film transistor, and a gate connected to a drain of said second thin film transistor; a sixth thin film transistor of a same conductive type as said second conductive type, having a drain connected to a source of said fourth thin film transistor, and a gate connected to a drain of said first thin film transistor; a first voltage regulating circuit connected between a source of said fifth thin film transistor and a second power source; and a second voltage regulating circuit connected between a source of said sixth thin film transistor and said second power source, wherein said first and second input signals of a first voltage amplitude is converted to a signal of a second voltage amplitude to thereby output a signal from at least one of said drains of said first thin film transistor or said second thin film transistor.

2. An active matrix type display device according to claim 1 , wherein said voltage regulating circuit comprises a thin film transistor having a drain and a gate thereof connected.

3. An active matrix type display device according to claim 1 , wherein said voltage regulating circuit has a resistor which contains a poly-silicon layer or a silicon layer doped with an impurity element.

4. An active matrix type display device according to claim 1 , wherein said voltage regulating circuit includes a thin film transistor having a constant voltage applied to a gate thereof.

5. An active matrix type display device according to claim 1 , wherein a voltage of said first power source is fixed to 0 V.

6. An active matrix type display device according to claims 1 , wherein said active matrix type display device is a liquid crystal display device.

7. An active matrix type display device according to claim 1 , wherein said an active matrix type display device is one selected from the group consisting of a mobile telephone, a video camera, a personal computer, a head mount display, a television, a portable book, a DVD player, a digital camera, and a projector.

8. An active matrix display device according to claim 1 , wherein said active matrix type display device is a light emitting device.

9. An active matrix type display device comprising: a plurality of pixel thin film transistors over a substrate; and a driver circuit over said substrate for driving said pixel thin film transistors, said driver circuit comprising at least a level shifter, wherein said level shifter comprising: a first thin film transistor of a first conductive type having a source connected to a first power source, and a gate to which a first input signal is inputted; a second thin film transistor of a same conductive type as said first conductive type, having a source connected to said first power source, and a gate to which a second input signal is inputted, wherein said second input signal is an inverted signal of said first input signal; a third thin film transistor of a second conductive type different from said first conductive type, having a drain connected to a drain of said first thin film transistor, and a gate connected to a drain of said second thin film transistor; a fourth thin film transistor of a same conductive type as said second conductive type, having a drain connected to a drain of said second thin film transistor, and a gate connected to a drain of said first thin film transistor; a first voltage regulating circuit connected between a source of said third thin film transistor and a second power source; and a second voltage regulating circuit connected between a source of said fourth thin film transistor and said second power source, wherein said first and second input signals of a first voltage amplitude is converted to a signal of a second voltage amplitude to thereby output a signal from at least one of said drains of said first thin film transistor or said second thin film transistor.

10. An active matrix type display device according to claim 9 , wherein said voltage regulating circuit comprises a thin film transistor having a drain and a gate thereof connected.

11. An active matrix type display device according to claim 9 , wherein said voltage regulating circuit has a resistor containing a poly-crystalline silicon layer or a silicon layer doped with an impurity element.

12. An active matrix type display device according to claim 9 , wherein said voltage regulating circuit includes a thin film transistor having a constant voltage applied to a gate thereof.

13. An active matrix type display device according to claim 9 , wherein a voltage of said first power source is fixed to 0 V.

14. An active matrix type display device according to claim 9 , wherein said active matrix type display device is a liquid crystal display device or a light emitting display device.

15. An active matrix type display device according to claim 9 , wherein said active matrix type display device is one selected from the group consisting of a mobile telephone, a video camera, a personal computer, a head mount display, a television, a portable book, a DVD player, a digital camera, and a projector.

16. An active matrix type display device comprising: a plurality of pixel thin film transistors over a substrate; and a driver circuit over said substrate for driving said pixel thin film transistors, said driver circuit comprising at least a level shifter, said level shifter comprising: a first thin film transistor of a first conductive type having a source connected to a first power source, and a gate to which a first input signal is inputted; a second thin film transistor of a same conductive type as said first conductive type, having a source connected to said first power source, and a gate to which a second input signal is inputted, wherein said second input signal is an inverted signal of said first input signal; a third thin film transistor of a second conductive type different from said first conductive type, having a drain connected to a drain of said first thin film transistor, and a gate to which said first input signal is inputted; a fourth thin film transistor of a same conductive type as said second conductive type, having a drain connected to a drain of said second thin film transistor, and a gate to which said second input signal is inputted; a fifth thin film transistor of a same conductive type as said second conductive type, having a drain connected to a source of said third thin film transistor, and a gate connected to a drain of said second thin film transistor; a sixth thin film transistor of a same conductive type as said second conductive type, having a drain connected to a source of said fourth thin film transistor, and a gate connected to a drain of said first thin film transistor; a first voltage regulating circuit connected between a source of said fifth thin film transistor and a second power source; and a second voltage regulating circuit connected between a source of said sixth thin film transistor and said second power source.

17. An active matrix type display device according to claim 16 , wherein a voltage of said first power source is fixed to 0 V.

18. An active matrix type display device according to claim 16 , wherein said active matrix type display device is a liquid crystal display device.

19. An active matrix display device according to claim 16 , wherein said active matrix type display device is a light emitting device.

20. An active matrix type display device according to claim 16 , wherein said active matrix type display device is one selected from the group consisting of a mobile telephone, a video camera, a personal computer, a head mount display, a television, a portable book, a DVD player, a digital camera, and a projector.

21. An active matrix type display device comprising: a plurality of pixel thin film transistors over a substrate; and a driver circuit over said substrate for driving said pixel thin film transistors, said driver circuit comprising at least a level shifter, said level shifter comprising: a first n-channel thin film transistor having a source connected to a first power source, and a gate to which a first input signal is inputted; a second n-channel thin film transistor having a source connected to said first power source, and a gate to which a second input signal is inputted, wherein said second input signal is an inverted signal of said first input signal; a third p-channel thin film transistor having a drain connected to a drain of said first n-channel thin film transistor, and a gate to which said first input signal is inputted; a fourth p-channel thin film transistor having a drain connected to a drain of said second n-channel thin film transistor, and a gate to which said second input signal is inputted; a fifth p-channel thin film transistor having a drain connected to a source of said third p-channel thin film transistor, and a gate connected to a drain of said second n-channel thin film transistor; a sixth p-channel thin film transistor having a drain connected to a source of said fourth p-channel thin film transistor, and a gate connected to a drain of said first n-channel thin film transistor; a first voltage regulating circuit connected between a source of said fifth p-channel thin film transistor and a second power source; and a second voltage regulating circuit connected between a source of said sixth p-channel thin film transistor and said second power source, wherein said first and second input signals of a first voltage amplitude are converted to a signal of a second voltage amplitude to thereby output a signal from at least one of said drains of said first n-channel thin film transistor or said second n-channel thin film transistor.

22. An active matrix type display device according to claim 21 , wherein a voltage of said first power source is fixed to 0 V.

23. An active matrix type display device according to claim 21 , wherein said active matrix type display device is a liquid crystal display device.

24. An active matrix display device according to claim 21 , wherein said active matrix type display device is a light emitting device.

25. An active matrix type display device according to claim 21 , wherein said active matrix type display device is one selected from the group consisting of a mobile telephone, a video camera, a personal computer, a head mount display, a television, a portable book, a DVD player, a digital camera, and a projector.

26. An active matrix type display device comprising: a plurality of pixel thin film transistors over a substrate; and a driver circuit over said substrate for driving said pixel thin film transistors, said driver circuit comprising at least a level shifter, said level shifter comprising: a first n-channel thin film transistor having a source connected to a first power source, and a gate to which a first input signal is inputted; a second n-channel thin film transistor having a source connected to said first power source, and a gate to which a second input signal is inputted, wherein said second input signal is an inverted signal of said first input signal; a third p-channel thin film transistor having a drain connected to a drain of said first n-channel thin film transistor, and a gate to which said first input signal is inputted; a fourth p-channel thin film transistor having a drain connected to a drain of said second n-channel thin film transistor, and a gate to which said second input signal is inputted; a fifth p-channel thin film transistor having a drain connected to a source of said third p-channel thin film transistor, and a gate connected to a drain of said second n-channel thin film transistor; a sixth p-channel thin film transistor having a drain connected to a source of said fourth p-channel thin film transistor, and a gate connected to a drain of said first n-channel thin film transistor; a first voltage regulating circuit comprising a seventh p-channel thin film transistor connected between a source of said fifth p-channel thin film transistor and a second power source; and a second voltage regulating circuit comprising an eighth p-channel thin film transistor connected between a source of said sixth p-channel thin film transistor and said second power source, wherein said first and second input signals of a first voltage amplitude are converted to a signal of a second voltage amplitude to thereby output a signal from at least one of said drains of said first n-channel thin film transistor or said second n-channel thin film transistor.

27. An active matrix type display device according to claim 26 , wherein a voltage of said first power source is fixed to 0 V.

28. An active matrix type display device according to claim 26 , wherein said active matrix type display device is a liquid crystal display device.

29. An active matrix display device according to claim 26 , wherein said active matrix type display device is a light emitting device.

30. An active matrix type display device according to claim 26 , wherein said active matrix type display device is one selected from the group consisting of a mobile telephone, a video camera, a personal computer, a head mount display, a television, a portable book, a DVD player, a digital camera, and a projector.

31. An active matrix type display device comprising: a plurality of pixel thin film transistors over a substrate; and a driver circuit over said substrate for driving said pixel thin film transistors, said driver circuit comprising at least a level shifter, said level shifter comprising: a first n-channel thin film transistor having a source connected to a first power source, and a gate to which a first input signal is inputted; a second n-channel thin film transistor having a source connected to said first power source, and a gate to which a second input signal is inputted, wherein said second input signal is an inverted signal of said first input signal; a third p-channel thin film transistor having a drain connected to a drain of said first n-channel thin film transistor, and a gate to which said first input signal is inputted; a fourth p-channel thin film transistor having a drain connected to a drain of said second n-channel thin film transistor, and a gate to which said second input signal is inputted; a fifth p-channel thin film transistor having a drain connected to a source of said third p-channel thin film transistor, and a gate connected to a drain of said second n-channel thin film transistor; a sixth p-channel thin film transistor having a drain connected to a source of said fourth p-channel thin film transistor, and a gate connected to a drain of said first n-channel thin film transistor; a first voltage regulating circuit comprising a seventh n-channel thin film transistor connected between a source of said fifth p-channel thin film transistor and a second power source, wherein a gate of said seventh n-channel thin film transistor is connected to a drain thereof; and a second voltage regulating circuit comprising an eighth n-channel thin film transistor connected between a source of said sixth p-channel thin film transistor and said second power source, wherein a gate of said eighth n-channel thin film transistor is connected to a drain thereof, and wherein said first and second input signals of a first voltage amplitude are converted to a signal of a second voltage amplitude to thereby output a signal from at least one of said drains of said first n-channel thin film transistor or said second n-channel thin film transistor.

32. An active matrix type display device according to claim 31 , wherein a voltage of said first power source is fixed to 0 V.

33. An active matrix type display device according to claim 31 , wherein said active matrix type display device is a liquid crystal display device.

34. An active matrix display device according to claim 31 , wherein said active matrix type display device is a light emitting device.

35. An active matrix type display device according to claim 31 , wherein said active matrix type display device is one selected from the group consisting of a mobile telephone, a video camera, a personal computer, a head mount display, a television, a portable book, a DVD player, a digital camera, and a projector.